# US 7,609,482 B2 · Magnetic head slider supporting device including conductor for reducing crosstalk between lines > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,482 B2 - Document ID: US7609482B2 - Status: Granted - Kind: B2 - Application number: 11/186,834 - Filed: 2005-07-22 - Published: 2006-05-04 - Granted: 2009-10-27 - Earliest claimed: 2004-08-03 - Assignees: TDK Corporation - Inventors: Hiroshi Kiyono - Web page: https://patentgrep.com/patent/US7609482B2 ## CPC - H05K 1/0228: {Compensation of cross-talk by a mutually correlated lay-out of printed circuit traces, e.g. for compensation of cross-talk in mounted connectors (balanced signal pairs H05K1/0245)} - G11B 5/4853: {Constructional details of the electrical connection between head and arm} - G11B 5/486: {with provision for mounting or arranging electrical conducting means or circuits on or along the arm assembly} - G11B 5/484: {Integrated arm assemblies, e.g. formed by material deposition or by etching from single piece of metal or by lamination of materials forming a single arm/suspension/head unit} - H05K 1/056: {the metal substrate being covered by an organic insulating layer} - H05K 2201/09781: Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A magnetic head slider supporting apparatus comprises: a suspension flexibly supporting a slider; and a flexible wiring board. The suspension incorporates a load beam. The flexible wiring board is disposed along the load beam. The flexible wiring board includes: first and second lines for connecting a write element that the slider includes to a read/write processing circuit; and third and fourth lines for connecting a read element that the slider includes to the read/write processing circuit. The flexible wiring board further includes two conductors for generating two parasitic capacitances for reducing potential differences created between the third and fourth lines due to write signals transmitted through the first and second lines. ## Claims ### Claim 1 A magnetic head slider supporting apparatus comprising: a suspension flexibly supporting a magnetic head slider incorporating a write element and a read element, such that the slider faces toward a recording medium; a first line and a second line that are connected to the write element and transmit write signals to be applied to the write element; a third line and a fourth line that are connected to the read element and transmit read signals outputted from the read element; and a conductor electrically connected to the third line, the conductor generating a parasitic capacitance for reducing a potential difference created between the third and fourth lines due to the write signals transmitted through the first and second lines, wherein: the suspension incorporates a plate-spring-shaped load beam; the first to fourth lines include portions disposed along the load beam; the portions of the first to fourth lines disposed along the load beam are located side by side in the order of the first line, the second line, the third line and the fourth line; the conductor is disposed adjacent to the first line with a space, and generates a parasitic capacitance between the first and third lines; and the first line is sandwiched between the second line and the conductor. ### Claim 2 (depends on 1) The magnetic head slider supporting apparatus according to claim 1, wherein an equation C7=(C1−C2)−(C3−C4) holds, where: C1 is a parasitic capacitance between the second and third lines; C2 is a parasitic capacitance between the first and third lines excluding the parasitic capacitance generated by the conductor; C3 is a parasitic capacitance between the second and fourth lines; C4 is a parasitic capacitance between the first and fourth lines; and C7 is the parasitic capacitance generated by the conductor. ### Claim 3 (depends on 1) A head gimbal assembly comprising: the magnetic head slider supporting apparatus according to claim 1. ### Claim 4 (depends on 1) A head arm assembly comprising: the magnetic head slider supporting apparatus according to claim 1; and an arm for moving the magnetic head slider across tracks of the recording medium, wherein the suspension is attached to the arm. ### Claim 5 (depends on 1) A magnetic disk drive comprising: the magnetic head slider supporting apparatus according to claim 1; an alignment device for moving the supporting apparatus and thereby aligning the magnetic head slider with respect to the recording medium; and a read/write processing circuit, wherein the read/write processing circuit applies the write signals to the write element through the first and second lines and receives the read signals from the read element through the third and fourth lines. ### Claim 6 (depends on 5) The magnetic disk drive according to claim 5, wherein the read/write processing circuit applies voltages of substantially symmetric waveforms as the write signals to the first and second lines.